noaa-lake-16014 Bregne Ice Cap East Greenland Holocene Paleolimnology Data Levy, L.B.; Kelly, M.A.; Lowell, T.V.; Hall, B.L.; Hempel, L.A.; Honsaker, W.; Lusas, A.R.; Howley, J.A.; Axford, Y. Bregne Ice Cap East Greenland Holocene Paleolimnology Data 2014-01-17 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16014 Investigator L.B. Levy Investigator M.A. Kelly Investigator T.V. Lowell Investigator B.L. Hall Investigator L.A. Hempel Investigator W. Honsaker Investigator A.R. Lusas Investigator J.A. Howley Investigator Y. Axford earth science paleoclimate paleolimnology inorganic carbon,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology silt,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 2-4um earth science paleoclimate paleolimnology silt,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 4-20um earth science paleoclimate paleolimnology volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,x10-5 units earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology clay,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction <2um earth science paleoclimate paleolimnology sample identification,null,null,null,null,paleolimnology,null,null,C,null earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,depth in section earth science paleoclimate paleolimnology biogenic silica,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology organic matter,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology sand,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 50-250um earth science paleoclimate paleolimnology silt,sediment,null,percent,null,paleolimnology,null,null,N,grainsize fraction 20-50um earth science paleoclimate paleolimnology magnetic susceptibility earth science paleoclimate paleolimnology age control earth science paleoclimate paleolimnology geochemistry geoscientificInformation 12000 cal yr BP 0 cal yr BP Complete 70.907 70.909 -25.595 -25.585 690 800 Continent North America Greenland Last Chance Lake>LATITUDE 70.909>LONGITUDE -25.585 Continent North America Greenland Bregne Ice Cap>LATITUDE 70.907>LONGITUDE -25.595 Continent North America Greenland Two Move Lake>LATITUDE 70.907>LONGITUDE -25.591 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Laura B. Levy, Meredith A. Kelly, Thomas V. Lowell, Brenda L. Hall, Laura A. Hempel, William M. Honsaker, Amanda R. Lusas, Jennifer A. Howley, Yarrow L. Axford 2014 Quaternary Science Reviews 10.1016/j.quascirev.2013.06.024 http://www.sciencedirect.com/science/article/pii/S0277379113002448

The Greenland Ice Sheet is a major component of the Arctic cryosphere and the magnitude of its response to future climate changes remains uncertain. Longer-term records of climate near the ice sheet margin provide information about natural climate variability and can be used to understand the causes of past changes in the Greenland Ice Sheet. As a proxy for Holocene climate near the ice sheet margin, we reconstruct the fluctuations of Bregne ice cap in the Scoresby Sund region of central east Greenland. Bregne is a small ice cap (2.5 km2 in area) and responds sensitively to summer temperatures. We employ a multi-proxy approach to reconstruct the ice cap fluctuations using geomorphic mapping, 10Be ages of boulders and bedrock and lake sediment records. Past extents of Bregne ice cap are marked by moraines and registered by sediments in downvalley lakes. 10Be ages of bedrock and boulders outboard of the moraines indicate that Bregne ice cap was within ~250 m of its present-day limit by at least 10.7 ka. Multi-proxy data from sediments in Two Move lake, located downvalley from Bregne ice cap, indicate that the ice cap likely completely disappeared during early and middle Holocene time. Increasing magnetic susceptibility and percent clastic material from ~6.5 to ~1.9 cal ka BP in Two Move lake sediments suggest progressively colder conditions and increased snow accumulation on the highlands west of the lake. Laminated silt deposited at ~2.6 cal ka BP and ~1.9 cal ka BP to present registers the onset and persistence of Bregne ice cap during the late Holocene. 10Be ages of boulders on an unweathered, unvegetated moraine in the Bregne ice cap forefield range from 0.74 to 9.60 ka. The youngest 10Be age (0.74 ka) likely represents the age of the moraine whereas older ages may be due to 10Be inherited from prior periods of exposure. This late Holocene moraine marks the second largest advance of the ice cap since deglaciation of the region at the end of the last ice age. The oldest moraine in the forefield dates to <=2.6 cal ka BP. The fluctuations of Bregne ice cap were likely influenced by Northern Hemisphere summer insolation throughout the Holocene and abrupt late Holocene cold events. STUDY NOTES: Lake sediment analyses (MS, LOI, grainsize, 14C dating, Biogenic silica) from lakes near Bregne ice cap, Scoresby Sund, eastern Greenland. Also included are 10Be ages from boulders on the historical moraines and boulders and bedrock just distal to the historical moraines.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/bregne2014-10be.txt Boulder 10Be ages; Formatted text file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014organic.txt Last Chance Lake Organic Matter ; Formatted text file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014biosi.txt Last Chance Lake Biogenic Si; Formatted text file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/last-chance2014ms.txt Last Chance Lake Magnetic Susceptibility; Formatted text file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014ms.txt Two Move Lake Magnetic Susceptibility; Formatted text file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greenland/two-move2014composition.txt Two Move Lake Sediment Composition; Formatted text file USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11